1. National Information Society Agency, Daegu 41068, Republic of Korea
2. School of Computer Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
3. Department of Artificial Intelligence, Kyungpook National University, Daegu 41566, Republic of Korea
4. Department of Radiology, Kyungpook National University Chilgok Hospital, Kyungpook National University, Daegu 41404, Republic of Korea